نتایج جستجو برای: optical materials
تعداد نتایج: 683323 فیلتر نتایج به سال:
The contrast ratio, light reflectivity, scattering coefficient, and absorption coefficient of four composites and an unfilled resin were calculated algebraically from reflection spectrophotometric data using Kubelka's equations. The correlation coefficient between calculated and experimental values of contrast ratio was 0.9996. Values of infinite optical thickness ranged from 4.19 to 6.70 mm.
The seven papers making up this assessment are based on the Workshop on Nonlinear Optical Materials held in April 1986.
Due to their potential applications for optical communications, data storage, and electrooptical signal processing, molecules with nonlinear optical (NLO) properties have been extensively investigated.’ As part of our interest in porphyrins and metalloporphyrins as photoresponsive2 and field-responsive material^,^ we have synthesized a series of “push-pull” porphyrins containing both donor and ...
Dynamic multiple light scattering (diffusing wave spectroscopy, DWS) has been used to study the viscoelastic properties of soft materials. Several new multiple scattering approaches were implemented to extend the range of application of this optical microrheology technique. Taking advantage of the recently developed “two-cell technique” we show how DWS can be used to investigate the properties ...
The paper is focused on dynamic holographic technique application to reversible nonlinear optical media diagnostics. This technique based on phase-modulated optical beams self-diffraction allows to obtain simultaneous on-line information about photoinduced refraction index and absorption variations. Potential materials for this method are photorefractive crystals, nanostructured inorganic mater...
Optical excitations in hexagonal nanonetwork materials, for example, Boron-Nitride (BN) sheets and nanotubes, are investigated theoretically. The bonding of BN systems is positively polarized at the B site, and is negatively polarized at the N site. There is a permanent electric dipole moment along the BN bond, whose direction is from the B site to the N site. When the exciton hopping integral ...
T he global communications infrastructure relies on optical fibre lasers and other photonics components. As traffic on these networks continues to increase by a stunning 40% per year, hardware companies are under pressure to reduce costs. There is thus a need for new, low-cost optical technologies that deliver high performance and can be manufactured in an environmentally friendly manner. On pa...
Organic ruthenium complexes and polymers with electrochromic activity in the near infrared region were prepared and their electrochemical and optical properties were investigated. The intrinsic attenuating property of these materials depends mainly on the concentration of the pair of ruthenium units in the complexes or polymers. One cured film had the attenuating power of 6.9 dB per micron thic...
The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350 to 850nm. Incident circular, linearly polarized, and unpolarized light produces significant spectral features in the case of samples containing chlorophyll such as leaves and cyanobacteria. Polarization scattering signatures are observed around the chlorophyll ‘red edge’ that ma...
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